Roll brush



April 27, 1943. c. B. JOSLIN ROLL BRUSH Filed June 23, 1941 2Sheets-Sheet l O-IAELES 8 Josu/v attymu A 27, 1943. c. B. JOSLIN ROLLBRUS H Filed June 23, 1941 2 Sheets-Sheet 2 3 1 vac/whom Gin-Wu? BJasz/N 11 tom/wag Patented Apr. 27, 1943 ROLL BRUSH Charles B. J oslin,Hollidays Cove, W. Va., assignor to National Steel Corporation, acorporation of Delaware Application June 23, 1941, Serial No. 399,345

1 Claim.

This invention relates to machinery for coating sheet or strip materialwherein rolls are used to distribute the coating liquid on the sheet orstrip material, the improvement being in the finishing rolls and brushor wiper used to free the rolls of excess coating liquid and spread theresidue evenly on the rolls together with the method of making thebrush.

In the tinning art as in other coating arts the sheet or strip materialto be coated hereinafter called sheet metal is passed through a bath ofliquid coating material, in the particular instance, molten tin,spelter, terne or similar metal, The sheet metal is then passed betweenrolls which squeeze the excess tin off the plate and at the same timedistribute the tin more or less evenly over the surface of thesheetmetal. How well this latter step is accomplished depends in good part onhow well the tin is distributed over the roll. The excess tin squeezedoff the sheet tends to remain on the roll and to remove this excess tinwhile retaining enough tin on the roll to give a final proper depth ofcoating on the sheet is the duty of the roll brush or wiper.

When all tin plate was rolled from hot pack rolled sheets no greatproblem existed as to applying the tin to the sheets. Such sheets had asurface of a comparatively rough porous nature, and the tin was readilyapplied thereto.

However, with the advent of cold rolled sheets into the tin plateindustry, difficulty was experienced in applying an even coating to thesheets due to the highly polished surface. Also, in recent yearstremendous effort has been exerted to get a more uniform and evencoating than ever before while using little more or even less tin. As aresult of these factors much interest has been directed to the tin millroll and brush.

The temperature of the tin pot and the liquid tin necessitates the useof some material in the brush which is not deleteriously affected byhigh temperature. Two common materials are laminated asbestos fabric andsoapstone. The asbestos fabric in the past has been strengthened withbronze wire. When this was insuflicient the soapstone brushes were used,or even a combination of the soapstone and asbestos. The soapstone isobjectionable, however, due to its rela tively extreme hardness and theresulting rollwearing characteristics of the wipers incorporating it.Metallic scrapers have been tried, but they lack the required wipingaction.

Attempts have been made to stiffen the lamistiff enough to withstand asatisfactory pressure against the roll and yet all the component partsare much softer than any material heretofore used, so that marring ofthe roll is avoided. The advantages flowing from the change in thepresent brush over the prior art are numerous. Mushrooming of the brushby separation of the laminations is prevented. This gives immeasurablylonger life to the element besides eliminating "brush streaking" causedby coating metal collecting in the crevices between the spreadlaminations. The fact that the iron strips actually engage the rollprevents build-up of the coating on the roll in those portions notengaging the tin plate. Such build-up is always present with the oldform of roll brush and prevents processing of wide sheets after narrowersheets have been passed through the machine. Besides preventing build-upof the coating on the roll the brush of the present invention keeps theroll clean and free from scruff.

A further advantage of the present invention is that the combination ofthe iron strip and the asbestos laminations gives a more uniform coatingdepth because the iron strip acts to remove hard and tough deposits fromthe roll while acting as reinforcing or backing for the soft butefilcient wiping material, the latter giving the eflicient spreadingaction to the coating on the roll. Along this line it is to be notedthat the brush of the present invention is much more easily set inaccurate relationship to the roll by the brushman. This individualwatches the tin plate issuing from the machine and if the coating isheavier adjacent one side edge than the other he adjusts the pressure ofthe brush against the roll so as to more evenly distribute the tin. Theold form of brush was squashy" and until it mushroomed out so that thebrushholder was being forced against the roll, had no appreciableresistance or body. The brush of the present invention, on the otherhand, is stiff and presents a firm resistance to pressure forcing itagainst the roll. The brushman can, therefore, readily determine by feelor body-response of the brush just about what pressure it is exerting onthe roll.

It will be obvious that manufacture of a laminated asbestor strip with aplurality of iron strips interleaved in the laminations would be easierandless costly than incorporating bronze wires in each individual sheetof asbestos in a similar laminated strip in place of the iron strips.

An important object of the present invention is the provision of animproved roll brush or wiper for coating machines.

A further important object of the present invention is the provision ofa roll brush or wiper having a longer life that those now used.

A still further important object of the present invention is theprovision of an improved roll brush or wiper having many operatingadvantages over those now in use.

A still further important object of the present invention is theprovision of a roll brush or wiper which is cheaper to construct thanthose now in A still further important object of the present inventionis the provision of an economical method of making the roll brush orwiper of the present invention.

Other objects and advantages of this invention will become apparent fromthe following detailed description thereof, reference being had to theaccompanying drawings which constitute a part of this specification, andwherein;

Figure 1 is a view in sectional elevation of a coating machineincorporating the present invention,

Figure 2 is an enlarged detail view in section of the improved rollbrush, and

Figure 3 is a view in perspective of an intermediate product in theimproved method of the present invention.

Referring to the figures wherein like numerals denote like elementsthroughout, reference numeral i indicates a coating machine frame of theconventional tin machine type, which is adapted to be suspended in theusual tin pot having a molten metal coating therein covered by the usualoxidation preventing oil. Journalled in frame ID are three pairs offinishing rolls II, and I2, acting against each other with an adjustablepressure, and adapted to be located above the coating material but inthe oil. A guide I3 is carried by frame ID with its lower end in such aposition that it will be submerged in the coating material. This guidel3 directs the metal sheets being treated up to the first rolls II andII, which, in turn, move the sheet on upwardly to the next rolls II and[2, etc. Arranged along each roll is a roll brush indicated generally atH including a brush element I5 pressed against the roll, all the brushelements being of identical construction. Each roll brush element isheld by a brushholder i6, which, in turn, is suspended on a hanger i1.Brackets l8 .hold the hangers against lateral movement. Hangers I! aresuspended from frame Ill through the medium of springs I9 and adjustmentnuts threaded on the upper ends of the hangers and acting throughwashers 2i.

The brush element l5 of each brush is formed of laminations or sheets 22of heat resistant fibrous material such as asbestos superposed one onanother to form a thick sheet as best shown in Figures 2 and 3.Interleaved between some of the laminations are thin metal strips 23,two being shown specifically, but one or more may be used depending uponthe stiifness required of the wiper element and th hardness of the metalstrip. The laminations of fibrous material and are formed of wovenasbestos about one-tenth of an inch thick, although these laminationscould be thicker or thinner sheets without departing from the invention.The metal strip laminations in the preferred embodiment are formed froma soft commercial iron such as that referred to in the trade as Armcoiron. A thickness of .0015 of an inch has been found to be satisfactorywhere two strips of metal were used, although obviously a thicker stripcould be used with fewer laminations of metal or thinner strips with agreater number of laminations of metal,

It will be noted that all the brushes I4 are located below the level ofthe oxidation preventing oil in the conventional tin pot. The pressureadjustment of these brushes against the rolls must, therefore, be madeblindly through nuts 20. As wear occurs on a brush, the brushman takesup on nuts I! sufllciently to achieve the desired pressure and thus theproper depth of coating on the sheets passing between the associatedrolls. This pressure should be controlled very precisely from one end ofthe roll to the other to obtain good results. The brushes of the presentinvention, due to their stiffness, present a good body response duringadjustment to facilitate this operation.

Referring to Figure 2 specifically, the brush elements l5 are shownpositioned in brushholders it. Each brushholder is made up of an angleiron 25 and a bar 26, clamped to the brush element by bolt and nut 21,the latter serving to attach the brushholder to hanger H. A reinforcingmember 28 aids in directing the trailing edge of the brush elementagainst the roll but makes no contact with the roll.

In manufacturing the brush elements of the present invention, sheets offibrous material having sheets. of strip metal between them are stitchedtogether in rows of double stitching 2! as shown on Figure 3. Obviously,any desirable fastening means could be used in place of stitching solong as the effect of spaced rows is achieved. The rows of fasteningstitches are spaced apart a suflicient distance so that when theresultant article is out along a line 30 intermediate the rows ofstitching, a plurality of brush elements will result, two in the formshown on Figure 3. Metal strips 23 in the intermediate product of Figure3 need not be as wide as the fibrous material sheets, thereby saving themore expensive material. When the cut is made between the fasteningrows, a square edge is presented having the fibrous material and metalcoinciding. The strip metal need only extend towards the other side ofthe resulting brush element far enough to be engaged between the partsof the brushholder.

I claim:

A laminated brush adapted to serve as a wiper for a roll of a metalcoating machine, said brush comprising lengthwise extending layers ofheat resistant fabric and interleaved, soft, unabrasive, thin sheetmetal, of continuously uniform texture from end to end, the variouslayers being firmly secured together in relative positions such that theadjacently exposed marginal portions thereof are so related as to serveas parts of an even, smooth, wiping face, having its portions of softmetal and heat resistant fabric disposed therein in alternation.

CHARLES B. J OSLIN

